Level Control; Safety Rules During Operation - Wilo Rexa FIT Serie Manual Del Usuario

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6.2 Check the direction of rotation
The product is checked and adjusted in the factory to
ensure that the direction of rotation is incorrect. The
connection must be made according to the wiring code
information.
Before submerging, the product must be checked to
ensure that the rotation direction is correct.
A test run should only be performed under gen-
eral operating conditions. Switching on a unit that
has not been submerged is strictly forbidden!
6.2.1 Checking the rotation direction
The rotation direction must be checked with a rotating
field tester by a local electrician. For the correct rota-
tion direction, a clockwise rotating field must be avail-
able.
The product is not approved for operation with a
counter-clockwise rotating field.
6.2.2 If the direction of rotation is not correct
When using Wilo switching devices
Wilo switching devices are designed so that the con-
nected products are driven in the right direction. If the
rotation direction is wrong, 2 phases/leads of the mains
supply to the switching device must be replaced.
With switching devices provided by the customer:
If the rotation direction is wrong, with direct start
motors, 2 phases must be swapped. In the case of
star-delta start-up motors, the connections of two
windings must be swapped e.g. U1 with V1 and U2 with
V2.

6.3 Level control

Check the following points during level control:
• When using float switches, ensure that they can move
freely in the operating area!
• Check that the cable of the float switch is fixed cor-
rectly on the pressure pipe or wall.
• The water level must not fall below the minimum!
• The maximum starts per hour may not be exceeded!
6.4 Startup
Minor oil leakage in the mechanical shaft seal on deliv-
ery is no cause for concern. However, it must be
removed prior to submersion in the pumped liquid.
Keep out of the work area of the unit. No per-
sons are allowed in the work area during switch-
ing on and/or during operation.
Before switching on for the first time, the installation
must be checked as described in the "Installation"
chapter and an isolation check must be carried out
according to the "Maintenance" chapter.
Beware of serious injuries.
In portable installations, the unit can fall over
when it is switched on or during operation. Make
sure that the unit is positioned on a firm founda-
tion and that the pump pedestal is mounted cor-
rectly.
38
If the unit falls over, it must be switched off before
setting it up again.
In the case of versions with CEE plugs, note the IP pro-
tection class of the plug.
6.4.1 Before switching on
Check the following:
• Cable guidance – no loops, slightly taut
• Check the temperature of the pumped liquid and the
submersion depth – see technical data
• If a hose is used on the discharge side, it should be
flushed out with clean water before use to prevent any
sediment causing blockages
• Clean coarse deposits from the pump sump
• Clean the pipe systems on the discharge and intake
sides
• Open all sliders on the discharge and intake sides
Risk of fatal injury due to explosion!
If the shut-off valves on the intake and dis-
charge side are closed during operation, the fluid
in the hydraulic housing will be heated up by the
pumping movement. Considerable pressure is
created in the hydraulic housing by the heating.
The pressure can cause the unit to explode!
Before switching on the unit, ensure that all the
valves are open.
• The hydraulic housing must be flooded, i.e. it should be
completely full of fluid, with no air in it at all. Bleeding
can be carried out using a suitable bleeding device in
the system, or, if available, with bleeder screws on the
discharge port.
• Check that all accessories, the pipe system and sus-
pension unit are properly fitted
• Check all level control and dry-run protection systems
6.4.2 After starting up
The rated current is briefly exceeded during the start-
up procedure. Once the start-up procedure has com-
pleted, the operating current may no longer exceed the
rated current.
If the motor does not start immediately after the unit is
switched on, it must be switched off without delay.
The start pauses specified in the "Technical data"
chapter must be adhered to before starting up again. If
the fault recurs, the unit must be switched off again
immediately. The unit may only be restarted, once the
fault has been rectified.

6.5 Safety rules during operation

When operating the product, always follow the locally
applicable laws and regulations for work safety, acci-
dent prevention and handling electrical machinery. To
help to ensure safe working practice, the responsibili-
ties of employees should be clearly set out by the
owner. All personnel are responsible for ensuring that
regulations are observed.
The product has moving parts. During operation, these
parts turn to pump the fluid. Certain materials in the
WILO SE 10/2011 V4.1WE